CN201601638U

CN201601638U - Soft starter

Info

Publication number: CN201601638U
Application number: CN200920284625XU
Authority: CN
Inventors: 陆亚洲; 陈登峰
Original assignee: Zhangjiagang Huajie Electronics Co Ltd
Current assignee: Zhangjiagang Huajie Electronics Co Ltd
Priority date: 2009-12-17
Filing date: 2009-12-17
Publication date: 2010-10-06
Anticipated expiration: 2019-12-17

Abstract

The utility model discloses a soft starter with a small volume and low use cost, which comprises a pair of alternating-current input ends, a pair of alternating-current output ends, a rectifying circuit, a delay circuit, a trigger circuit, an on/off circuit and a current-limiting circuit. One alternating-current input end is connected with an alternating-current input end of the rectifying circuit and input ends of the on/off circuit and the current-limiting circuit; another alternating-current input end is connected with another alternating-current input end of the rectifying circuit and one alternating-current output end; another alternating-current output end is connected with output ends of the on/off circuit and the current-limiting circuit; a negative end of the rectifying circuit is connected with negative ends of the delay circuit and the trigger circuit; a positive end of the rectifying circuit is connected with power supply ends of the delay circuit and the on/off circuit; an output end of the delay circuit is connected with an input end of the trigger circuit; and an output end of the trigger circuit is connected with a control end of the on/off circuit. The starter can be used for soft starting of various electrical equipments, such as a motor and the like.

Description

A kind of soft initiator

Technical field

The utility model relates to a kind of soft initiator that is used for starter multiple electric equipments such as (motor).

Background technology

As everyone knows, when some inductor electric equipments such as motor start, when electric current is operate as normal 6～7 times, thus electrical network is produced very large influence.For this reason, the soft starting circuit or the PTC resistance of a complexity usually is set between the input of input power supply and motor, carries out current limliting during to motor starting, reached the effect of soft start by the soft starting circuit of a complexity or NTC resistance.The volume that uses complicated current-limiting circuit or NTC resistance is big, little, the temperature rise of loaded current, and price is higher, has increased use cost.

The utility model content

Technical problem to be solved in the utility model is: provide that a kind of volume is little, loaded current is big, temperature rise is low, can reduce the soft initiator of use cost greatly.

For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of soft initiator, comprise: a pair of ac input end and a pair of ac output end and rectification circuit, delay circuit, circuits for triggering, on-off circuit and current-limiting circuit, the ac input end of ac input end and rectification circuit and the input of on-off circuit and current-limiting circuit link to each other, another ac input end links to each other with an ac output end with another ac input end of rectification circuit, another ac output end links to each other with the output of on-off circuit and current-limiting circuit, the negative terminal of rectification circuit links to each other with the negative terminal of delay circuit and circuits for triggering, the anode of rectification circuit links to each other with the power end of delay circuit and on-off circuit, the output of delay circuit links to each other with the input of circuits for triggering, and the output of circuits for triggering links to each other with the control end of on-off circuit.

Be serially connected with the triggering current-limiting resistance between the output of described delay circuit and the input of circuits for triggering.

Described on-off circuit is a solenoid relay, and the two ends of its coil also are connected to the protection diode.

One of them ac input end of described rectification circuit links to each other with corresponding ac input end with the power supply input capacitance by the power supply input resistance that is connected in parallel.

The beneficial effects of the utility model are: volume of the present utility model is very little, and circuit is simple and direct, and loaded current is big, and temperature rise is low, and failure rate is low, and greatly reduces use cost.

Description of drawings

Fig. 1 is the electric theory structure schematic diagram of first kind of execution mode of the present utility model.

Fig. 2 is the electric theory structure schematic diagram of another kind of execution mode of the present utility model.

Among Fig. 1 to Fig. 2: 1, rectification circuit, 2, delay circuit, 3, circuits for triggering, 4, on-off circuit, 5, current-limiting circuit, 7, ac input end, 8, ac input end, 9, ac output end, 10, ac output end.

Embodiment

As shown in Figure 1, soft initiator described in the utility model, comprise: a pair of ac input end 7 and 8, a pair of

ac output end

9 and 10 and rectification circuit 1, delay circuit 2, circuits for triggering 3, on-off circuit 4 and current-limiting circuit 5, the ac input end of ac input end 7 and rectification circuit 1 and the input of on-off circuit 4 and current-limiting circuit 5 link to each other, ac input end 8 links to each other with ac output end 10 with another ac input end of rectification circuit 1, ac output end 9 links to each other with the output of on-off circuit 4 with current-limiting circuit 5, the negative terminal of rectification circuit 1 links to each other with the negative terminal of delay circuit 2 with circuits for triggering 3, the anode of rectification circuit 1 links to each other with the power end of delay circuit 2 with on-off circuit 4, the output of delay circuit 2 links to each other with the input of circuits for triggering 3 by triggering current-limiting resistance R3, and the output of circuits for triggering 3 links to each other with the control end of on-off circuit 4; Here, that on-off circuit 4 adopts is solenoid relay Relay1, the two ends of its coil also are connected to protection diode D1, the bearing capacity of solenoid relay is very strong, can carry the DC load of 40A/250V for a long time, and the power consumption of its coil is very low, usually between 0.3～1 watt, and very power saving; Described rectification circuit 1 is full-bridge type rectifier bridge heap BR1; The integrating circuit that described delay circuit 2 is made up of resistance R 2 and capacitor C 2 constitutes, power taking is held the voltage at C2 two ends as triggering signal, change the integrated value of capacitance-resistance, delay time is arranged between several milliseconds to several seconds, and, make each delay time can both be accurate by diode D1 being parallel to the discharge process of speed-up capacitor C2 on the resistance R 2; Described current-limiting circuit 5 mainly is made of resistance R 4, capacitor C 4, bidirectional diode DB1 and bidirectional triode thyristor T1; Described circuits for triggering 3 mainly are made of voltage stabilizing didoe DZ1, electric capacity R3 and current trigger controllable silicon SCR 1, G, K the two poles of the earth of current trigger controllable silicon SCR 1 are received at the two ends of capacitor C 3 respectively, be used for the noise signal that the filtering electrical network seals in, play anti-interference effect, prevent misoperation.

As shown in Figure 2, one of them ac input end of described rectification circuit 1 can also link to each other with ac input end 7 with power supply input capacitance C1 by the power supply input resistance R1 that is connected in parallel, and constitutes so-called pulsating direct current circuit.In order to suppress surge voltage, between ac input end 7 and 8, also be provided with piezo-resistance MOV.

Operation principle of the present utility model is: produce the phase place delaying current by resistance R 4, capacitor C 4, bidirectional diode DB1 and trigger bidirectional triode thyristor, give load (as motor) in the moment of energising output one fixing low-voltage, play and reduce the interference of load current electrical network, reduce to load on the vibration when starting, certain effect is also arranged useful life prolonging load; Meanwhile, 1 pair of rectification circuit charges by 2 pairs of capacitor C 2 of resistance R, makes the voltage at C2 two ends raise gradually; When the voltage that raises makes voltage stabilizing didoe DZ1 reverse breakdown, the 1 rapid conducting of current trigger controllable silicon SCR, the coil of solenoid relay Relay1 gets, make its a pair of normally opened contact connect, make respectively with this to ac input end 7 and ac output end 9 connections that normally opened contact links to each other, make the oepration at full load of motor even load.

Claims

1. soft initiator, comprise: a pair of ac input end and a pair of ac output end, it is characterized in that: also include rectification circuit, delay circuit, circuits for triggering, on-off circuit and current-limiting circuit, the ac input end of ac input end and rectification circuit and the input of on-off circuit and current-limiting circuit link to each other, another ac input end links to each other with an ac output end with another ac input end of rectification circuit, another ac output end links to each other with the output of on-off circuit and current-limiting circuit, the negative terminal of rectification circuit links to each other with the negative terminal of delay circuit and circuits for triggering, the anode of rectification circuit links to each other with the power end of delay circuit and on-off circuit, the output of delay circuit links to each other with the input of circuits for triggering, and the output of circuits for triggering links to each other with the control end of on-off circuit.

2. soft initiator according to claim 1 is characterized in that: be serially connected with the triggering current-limiting resistance between the output of described delay circuit and the input of circuits for triggering.

3. soft initiator according to claim 1 is characterized in that: described on-off circuit is a solenoid relay, and the two ends of its coil also are connected to the protection diode.

4. according to claim 1,2 or 3 described soft initiators, it is characterized in that: one of them ac input end of described rectification circuit links to each other with corresponding ac input end with the power supply input capacitance by the power supply input resistance that is connected in parallel.